Air-brake.



A. J. GAULIN & A. VAN WYKE.

AIR BRAKE.

APPLICATION FILED MAR. 10, 1914.

Patnted Dec. 8, 191:;

3mm: Alf/611L570 Gum,

' pointed out in the UNITED STATES PATENT OFFICE.

ARTHUR J. GAULIN AND ARTHUR VAN WYKE, 0F CHARLESTON, MASSACHUSETTS.

AIBABBAKE.

Specification of Letters Patent.

Patented Dec. 8, 1914.

Application filed March 10, 1914. Serial No. 823,769.

To all whom it may concern:

Be it known that we, ARTHUR J. GAULIN and ARTHUR VAN WYKE, citizens ofthe United States, residing at Charleston, in the county of Suffolk andState of Massachusetts, have invented new and useful Improvements inAir-Brakes, of which the following is a specification.

The primary object of the invention is the provision of a novel brakemechanism for vehicles, adapted to use a fluid medium and which ispositive and effective in operation.

The invention consists of a brake band, two brake cylinders, pistonsarranged to operate therein and novel connectin means between oppositeends of the braie band and the pistons, all as set forth hereinafter,appended claim and illustrated in the accompanying drawing which is aView in elevation of a brake drum, brake band and connecting andoperating means associated therewith embodying the invention.

The brake drum 1 may be of ordinary construction and arrangement, suchas commonly provided for use in connection with a vehicle wheel. Thebrake band 2 is arranged within the brake drum and engages the latterwhen expanded. Brake cylinders 3 are arranged within the drum upon 0posite sides of the axle and are connecte by means of a pipe 4 which inturn is connected with a pipe 5 which leads from a source of supply ofmotive medium. A piston 8 is arranged within each of the brake cylinders3 and has a rod 7. Levers b extend across the brake cylinders and eachof such levers is connected at one end to a piston rod 7 and at itsopposite end to the brake cylinder remote from that in which the pistonrod operates to which the lever 6 is connected. An ex ansion joint 9connects the levers 6 to e ends of the brake band 2 so that when thepistons 8 are forced outward in their respective cylinders the brakeband is expanded and caused to frictionally engage the inner side of thebrake drum. When the fluid medium is cut off from the brake cylindersand the latter are permitted to bleed the pistons 8 move inward and thebrake band 2 contracts and clears the brake drum thereby releasing thebrake. It is to be understood that the fluid medium may consist of steamor compressed air and may be supplied in any manner.

From the foregoing description, taken in connection with theaccompanying drawings, the advantages of the construction and of themethod of operation will be readily apparent to those skilled in the artto which the invention appertains, and while we have described theprinciple of operation of the invention, together with the device whichwe now consider to be the best em bodiment thereof, we desire to have itunderstood that the device shown is merely illustrative, and that suchchanges maybe made when desired as are within the scope of the inventionas claimed.

Having thus described the invention, what is claimed as new is In avehicle brake, the combination of a brake drum, a brake band arrangedfor conjoint piperation with the brake drum, oppositely isposed brakecylinders, a lever for each of the cylinders, such lever being pivotedat one end to one of the cylinders and connected at its opposite end tothe piston of the other brake cylinder, connecting means between saidlevers and-the ends of the brake bands and means for supplying pressureto the brake cylinders.

In testimony whereof we afiix our signa tm-es in presence of twowitnesses.

ARTHUR J. UAULIN. ARTHUR VAN WYKE. Witnesses: I

M. SINGER, M. M. CHEW.

